| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * Copyright (C) 2010 |
| * Reinhard Meyer, reinhard.meyer@emk-elektronik.de |
| * |
| * General Purpose Backup Registers |
| * Based on AT91SAM9XE datasheet |
| */ |
| |
| #ifndef AT91_GPBR_H |
| #define AT91_GPBR_H |
| |
| /* |
| * The Atmel AT91SAM9 series has a small resource of 4 nonvolatile |
| * 32 Bit registers (buffered by the Vbu power). |
| * |
| * Please consider carefully before using this resource for tasks |
| * that do not really need nonvolatile registers. Maybe you can |
| * store information in EEPROM or FLASH instead. |
| * |
| * However, if you use a GPBR please document its use here and |
| * reference the define in your code! |
| * |
| * known typical uses of the GPBRs: |
| * GPBR[0]: offset for RTT timekeeping (u-boot, kernel) |
| * GPBR[1]: unused |
| * GPBR[2]: unused |
| * GPBR[3]: bootcount (u-boot) |
| */ |
| #define AT91_GPBR_INDEX_TIMEOFF 0 |
| #define AT91_GPBR_INDEX_BOOTCOUNT 3 |
| |
| #ifndef __ASSEMBLY__ |
| |
| typedef struct at91_gpbr { |
| u32 reg[4]; |
| } at91_gpbr_t; |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| #endif |
